Justiciability

Article III extends the federal judicial power only to cases and controversies, and the Supreme Court has read that phrase to limit courts to real disputes between parties with a concrete stake. The principle took shape early: in 1793, when Secretary of State Thomas Jefferson asked the justices for advice on questions of international law, they declined, saying it would be improper for judges to give extrajudicial opinions. Federal courts have refused to issue advisory opinions ever since, as the Court reaffirmed in Muskrat v. United States in 1911, though some state courts may give them.

The main justiciability doctrines are standing, which requires a plaintiff to show a concrete injury caused by the defendant that a court can remedy, ripeness, which keeps courts from deciding disputes before they have fully developed, and mootness, which ends a case when events make a ruling pointless, with exceptions for situations capable of repetition yet evading review, such as pregnancy in Roe v. Wade in 1973. The political question doctrine removes certain issues committed to the elected branches. In Abbott Laboratories v. Gardner in 1967 the Court allowed some challenges to regulations before enforcement, shaping ripeness in administrative law.

Justiciability doctrines often decide major cases without reaching the merits, as in FDA v. Alliance for Hippocratic Medicine in 2024, where the Court held that doctors opposed to abortion lacked standing to challenge the approval of mifepristone, and United States v. Texas in 2023, rejecting states' standing to challenge immigration enforcement priorities. Supporters say these limits keep courts within their proper role and leave policy disputes to elected officials. Critics say they are applied inconsistently and can leave serious legal violations without any judicial remedy.